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Pension and Other Postretirement Benefits (Schedule of Changes in Net Loss and Prior Service Cost/(Credit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Net loss      
Balance at beginning of period $ 1,802 $ 1,808 $ 1,962
Reclassification to net periodic benefit cost (1,629) (150) (137)
Current year loss / (gain) 640 118 (53)
Amendments (1) 0 0
Foreign currency translation 2 26 36
Balance at end of period 814 1,802 1,808
Prior service      
Balance at beginning of period 8 8 (6)
Reclassification to net periodic benefit cost (4) (1) 14
Current year loss / (gain) (2) 0 0
Amendments 0 1 0
Foreign currency translation 0 0 0
Balance at end of period 2 8 8
Other Postretirement Benefits      
Net loss      
Balance at beginning of period 45 42 31
Reclassification to net periodic benefit cost (4) (4) (3)
Current year loss / (gain) (20) 7 14
Amendments 0 0 0
Balance at end of period 21 45 42
Prior service      
Balance at beginning of period (46) (72) (105)
Reclassification to net periodic benefit cost 26 26 34
Current year loss / (gain) 0 0 0
Amendments 0 0 (1)
Balance at end of period $ (20) $ (46) $ (72)